Performance Study On Subgrade-Beam Structure In Medium And Low Speed Maglev Test Line

With the construction of urbanization and urban-rural integration, urban railway system has new opportunities for development. Maglev train is a new kind of advanced vehicle with high speed, low noise, environmental protection, economics and comfort. It is used to be the skeleton of city as well as the transportation of scene with metro and light rail in order to increase people’s travel efficiency and quality of living. Different from traditional rail train, box beam is the main part of the maglev’s line supporting F rail on the top and holding guided way on both sides. It’s lack of research on the subgrade because bridge is the main part of maglev’s line in most of the time all of the world. Subgrade-beam structure combines the characteristics of box beam and traditional subgrade, ensuring the continuity of structure in bridge-subgrade transition section while causing smaller vertical deformation to operate the trains more smoothly. Because this is the first application of structural engineering practice, the force mechanism and deformation characteristics are unclear, it is an urgent task to research the study of the mechanical properties under static and dynamic load for the subgrade-beam of maglev line.First of all, depending on CSR medium and low speed maglev line, investigate data of beam structure in maglev line at home and abroad. Using Winkler elastic foundation beam theory, analyze the interaction between beam structure and subgrade also the internal force calculation for different types of subgrade-beam structure.Secondly, based on nonlinear finite element software ABAQUS, build three-dimensional model for different types of subagrade-beam structure to analyze internal force distribution, acceleration response, deformation and soil pressure distribution and attenuation while comparing different performance between three structures under static and dynamic load or different combination modes.Finally, test structure response of CSR medium and low speed maglev line under vehicle load in order to analyze dynamic performance of beam and dynamic soil pressure distribution of subgrade with different vehicle load and speed.In conclusion, analyze and conclude the mechanism, deformation characteristics, dynamic performance of beam-subgrade structure. In combination with theoretical calculation, numerical calculation and field experiment, we certify the rationality of the new structure design and the performance difference on different types, provide reference and data on supporting promotion and application of this structure in future.